Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy

Jinxuan Bai, Qingshun Bai, Zhen Tong, Chao Hu, Xin He

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.
LanguageEnglish
Pages3919-3929
Number of pages11
JournalJournal of Materials Research
Volume31
Issue number24
Early online date28 Nov 2016
DOIs
Publication statusPublished - 28 Dec 2016

Fingerprint

Crystal microstructure
titanium alloys
Dislocations (crystals)
Titanium alloys
mechanical properties
Mechanical properties
Grain boundaries
Edge dislocations
edge dislocations
Nucleation
grain boundaries
grain size
scale effect
Microstructure
softening
nucleation
microstructure
simulation
interactions

Cite this

Bai, Jinxuan ; Bai, Qingshun ; Tong, Zhen ; Hu, Chao ; He, Xin. / Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy. In: Journal of Materials Research. 2016 ; Vol. 31, No. 24. pp. 3919-3929.
@article{905b11293aaa4342a18a9049d241a4bf,
title = "Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy",
abstract = "In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.",
keywords = "Titanium alloy, Plastic behavior, Multiscale simulation, Grain refinement, Dislocation dynamics",
author = "Jinxuan Bai and Qingshun Bai and Zhen Tong and Chao Hu and Xin He",
year = "2016",
month = "12",
day = "28",
doi = "10.1557/jmr.2016.444",
language = "English",
volume = "31",
pages = "3919--3929",
journal = "Journal of Materials Research",
issn = "0884-2914",
publisher = "Materials Research Society",
number = "24",

}

Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy. / Bai, Jinxuan; Bai, Qingshun; Tong, Zhen; Hu, Chao; He, Xin.

In: Journal of Materials Research, Vol. 31, No. 24, 28.12.2016, p. 3919-3929.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Evolution of surface grain structure and mechanical properties in orthogonal cutting of titanium alloy

AU - Bai, Jinxuan

AU - Bai, Qingshun

AU - Tong, Zhen

AU - Hu, Chao

AU - He, Xin

PY - 2016/12/28

Y1 - 2016/12/28

N2 - In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.

AB - In this study, a mesoscale dislocation simulation method was developed to study the orthogonal cutting of titanium alloy. The evolution of surface grain structure and its effects on the surface mechanical properties were studied by using two-dimensional climb assisted dislocation dynamics technology. The motions of edge dislocations such as dislocation nucleation, junction, interaction with obstacles, and grain boundaries, and annihilation were tracked. The results indicated that the machined surface has a microstructure composed of refined grains. The fine-grains bring appreciable scale effect and a mass of dislocations are piled up in the grain boundaries and persistent slip bands. In particular, dislocation climb can induce a perfect softening effect, but this effect is significantly weakened when grain size is less than 1.65 μm. In addition, a Hall–Petch type relation was predicted according to the arrangement of grain, the range of grain sizes and the distribution of dislocations.

KW - Titanium alloy

KW - Plastic behavior

KW - Multiscale simulation

KW - Grain refinement

KW - Dislocation dynamics

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-84997498685&origin=resultslist&sort=plf-f&src=s&st1=Evolution+of+surface+grain+structure+and+mechanical+properties+in+orthogonal+cutting+of+titanium+alloy&st2=&sid=fa185f8a8ba09949714890b2dc01e473&sot=b&sdt=b&sl=117&s=TITLE-ABS-KEY%28Evolution+of+surface+grain+structure+and+mechanical+properties+in+orthogonal+cutting+of+titanium+alloy%29&relpos=0&citeCnt=6&searchTerm=

U2 - 10.1557/jmr.2016.444

DO - 10.1557/jmr.2016.444

M3 - Article

VL - 31

SP - 3919

EP - 3929

JO - Journal of Materials Research

T2 - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 24

ER -